21253421563110 has 48 divisors (see below), whose sum is σ = 60282432072720. Its totient is φ = 5152344621120.

The previous prime is 21253421563091. The next prime is 21253421563201. The reversal of 21253421563110 is 1136512435212.

21253421563110 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 3 + 4 + 2 + 1 + 5 + 631 + 10 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10734050305 + ... + 10734052284.

It is an arithmetic number, because the mean of its divisors is an integer number (1255884001515).

Almost surely, 2^{21253421563110} is an apocalyptic number.

21253421563110 is an abundant number, since it is smaller than the sum of its proper divisors (39029010509610).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21253421563110 is a wasteful number, since it uses less digits than its factorization.

21253421563110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21468102613 (or 21468102610 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

Adding to 21253421563110 its reverse (1136512435212), we get a palindrome (22389933998322).

The spelling of 21253421563110 in words is "twenty-one trillion, two hundred fifty-three billion, four hundred twenty-one million, five hundred sixty-three thousand, one hundred ten".